Sutra 2.34

Vitarkah himsadayah krta karita anumoditah lobha krodha moha purvakah mrdu madhya adhimatrah duhkha ajnana anantaphalah iti pratipaksabhavanam

Negative feelings, such as violence, are damaging to life, whether we act upon them ourselves, or cause or condone them in others. They are born of greed, anger or delusion and may be slight, moderate or intense. Their fruit is endless ignorance and suffering. To remember this is to cultivate the opposite.